This won't help much, but I just wanted to say that we have only ever had about 10 full night's sleep since DD was born - she is now 19 months old!
What I decided to do, in the end (after a few months of LO being awake for 2.5 hours per night when I first returned to work!!! - what a nightmare), was put a mattress in her room and sleep in there. In time, I ended up bringing her onto the mattress with me.
Now, DD sleeps on her own double mattress (I know, I know

) and I go to her when she wakes, which is normally only once a night, anytime between 2 and 5 am. Many nights I don't even remember getting up, I just find myself in her bed in the morning. So, I get to spend a few hours in bed with DH (and the dog

) and a few hours with DD in her bed.
I feel that I am now as rested as I ever was before she was born, but I make a big effort to get to bed at a reasonable time myself.
I am not suggesting you do what I am doing, I just wanted you to know that you are definitely not alone in part co-sleeping. (I have to say, I do like it a lot and I agree, she will become a big girl soon enough and not want me to be hanging around in her room, so I am going to enjoy it while I can).
Good luck with your plans - I'm sure it will all work out in time. And I hope the travelling goes well - if it was me, I wouldn't change anything until you get back - just roll with the punches re the naps and try and minimise how much lost sleep you get at night, in whatever way works for you.